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Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands | Oct. 31, 2018 | Apr. 30, 2018
--- | --- | ---
Inventory, Net [Abstract] |  |
Raw materials | $ 48,223 | $ 41,728
Work-in-process | 48,250 | 44,905
Finished goods | 35,423 | 34,111
Total FIFO inventories | 131,896 | 120,744
Reserve to adjust inventories to LIFO value | (15,943) | (15,943)
Total inventories | 115,953 | $ 104,801
Inventory carried under FIFO | 0 |
Inventory carried under LIFO | $ 0 |

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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